Our non-exhaustive list of examples includes A. \({D=2}\)  black hole by Witten [1]}, B. \({D=4}\)  spherical solution by Burgess et al. [2]}, C. \({D=10}\)  black 5-brane by Horowitz and Strominger [3]}, and D. \({D=10}\)  superstring with negative tension by Dabholkar et al. [4]}. All of them feature curvature singularities where \(F\)  vanishes, while \(G_{ij},\beta _{\mu \nu },\Psi \)  remain harmlessly regular. We first present our main idea by peeling off the aforementioned three layers of singularity from the `doubled' perspective.
